DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM, Diagnostic DTC:C120C/79

DTC Code DTC Name
C120C/79 Linear Solenoid Power Supply System Malfunction

DESCRIPTION

This DTC is output by the 4WD ECU assembly if a malfunction occurs in the linear solenoid power supply system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C120C/79

Linear Solenoid Power Supply System Malfunction

  1. When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is 9.5 V or more

  2. When the 4WD relay is on, the 4WD relay monitor remains off for 1 second or more while the voltage at the IG1 terminal is less than 9.5 V

  3. While the 4WD relay is off, the 4WD relay monitor remains on for 1 second or more immediately after the ignition switch is turned to ON

  • Wire harness and connector (IG1 circuit, GND circuit)

  • 4WD ECU assembly

WIRING DIAGRAM

C253611E05

CAUTION / NOTICE / HINT

Tip:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

    1. C270074C06

      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the 4WD ECU assembly connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G86-3 (IG1) -Body ground

      Ignition switch ON

      11 to 14 V

      Result

      Proceed to

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)

    1. Turn the ignition switch off.

    2. C270074C07

      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G86-4 (GND) -Body ground

      Always

      Below 1 Ω

      Result

      Proceed to

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC

    1. Clear the DTC.

      Click hereClick here

      Chassis > Four Wheel Drive > Clear DTCs

    2. Turn the ignition switch to ON.

    3. Check that no DTCs other than DTC C120C/79 have been output.

      Click hereClick here

      Chassis > Four Wheel Drive > Trouble Codes

      Result

      Proceed to

      DTCs other than C120C/79 are not output

      DTCs other than C120C/79 are output
    DTCs other than C120C/79 are not output

    REPLACE 4WD ECU ASSEMBLY

    Click here

    DTCs other than C120C/79 are output

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE

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